Favorite electronics for a pond?


Situation:
19 acres. Mini-pontoon that never leaves the water. Electric trolling motor.
Fish either vertically with jigs, or casting to weed-line for bass.


Want's:
Want to see structure and fish.
Big and bright enough screen that I can see it easily on sunny days.
Want it to stay on boat. Don't want more stuff to haul around. Taking tackle and a battery is all I want to mess with.


Max $500. Would prefer $300 or less.


Brands to absolutely stay away from?
Brands that you can't go wrong with?


I have never owned electronics for fishing. Have no clue what I want or even the differences between what's on the market. Someone tell me what I need/want?

19 acre watershed pond
LMB, BC/WC, Bluegill, Crawfish, GShiners